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Son believes MH370 could be hijacked

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Jack's elder sister is one of the passengers missing on Malaysia Airlines Flight 370

He has taken leave of his job to join other MH370 relatives searching for answers in Beijing

On Monday, Jack received a text announcing "none of those on board survived"

He and other passengers have joined forces to push for more information and proof

Jack's elder sister was returning from a holiday. Her connecting flight was through Kuala Lumpur on MH370. After news of the missing flight, Jack took leave from his job to come to Beijing in search of answers.